JSP code translation problem_问答_开发者_运维开发者技术经验分享

开发者 https://www.devze.com 2023-02-14 19:59 出处：网络

I am having problem with my JSP conversion (Servlet to JSP). this is my JSP code: <%@page contentType=\"text/html\" pageEncoding=\"UTF-8\"%>

相关专题：jakarta-ee

I am having problem with my JSP conversion (Servlet to JSP).

this is my JSP code:

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<jsp:directive.page import="java.io.*" />
<jsp:directive.page import="javax.servlet.*" />
<jsp:directive.page import="javax.servlet.http.*" />
<jsp:directive.page import="Inventory.Item"/>

<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Display Data</title>
</head> 
<body>
    <jsp:useBean id="inventory" class="Inventory.AddData" />
    <%!public class DisplayData extends HttpServlet {

            public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
                    throws ServletException, IOException {

                response.setContentType("text/html");
                PrintWriter out = response.getWriter();
                Item item = (Item) request.getAttribute("invenItem");

                if (item != null) {
                    out.println("Stock ID  : " + item.getStockID() + "<br/>");
                    out.println("Name      : " + item.getItemName() + "<br/>");
                    out.println("Unit Price: " + item.getUnitPrice() + "<br/>");
                    out.println("On Stock  : " + item.getOnStock() + "<br/>");
                    out.println("</body>");
                    out.println("</html>");
                } else {
                    RequestDispatcher rd =
                            request.getRequestDispatcher("/SearchPage.html");
                    rd.include(request, response);
                    rd = request.getRequestDispatcher("/AddData.html");
                    rd.include(request, response);
                }
            }
        }%>
</body>

This code was taken from a Servlet which shows an Information of the Entry searched by a user.

When I run this JSP code it opens a new page on my web server but Doesn't Display Anything Just a Blank Page.

Supposedly this will show the Information of the entry searched by a user. Please Help...

In the firs开发者_如何学编程t Place... Am I doing JSP translation right?

Using the Scriptlets Method in JSP

import the Object item by doing this.. package.*
No need to import the java packages.

On the body place this code instead.

     <% Item item = (Item) request.getAttribute("invenItem"); 
        if (item != null) { %>

           Stock ID  : <%= item.getStockID()  %><br>
           Name      : <%= item.getItemName() %><br>
           Unit Price: <%= item.getUnitPrice() %><br>
           On Stock  : <%= item.getOnStock() %><br>

     <%  } else {  %>
           <%@ include file ="DataForm.html" %><br>
           <%@ include file ="ItemEntry.html" %>
     <%  } %>

For the explanation, read this as per Mr BalucC's suggestion. Then try also creating JSP using javabeans and EL.

Note: There's already a javabeans in your code.. <jsp:useBean id="inventory" class="Inventory.AddData" /> view this for the javabeans and EL code